单项选择题

It's hard to confirm or refute that there's a causal relationship between the amount of fat we eat and the ______ of heart attacks.

A．incidence
B．impetus
C．momentum
D．emergence
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The survival of historic interests as we know it is ______ threat.
A．under
B．upon
C．within
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Every member of the original cast was signed ______ her.
A．in addition to
B．except
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